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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a91be65d44f44197ebfa66a81fe8d5781cd5181dc7e8dd76a493eee49726145' 
  AND token = '13IW9wE9P7biHZCwHzLFkUHZjcHX974iRcQdEvOa39I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}